Page 1 of 183
ABO ADVANCED STUDY GUIDE SET
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The sag lens formula:
A. Does not apply to lenses with spherical curves
B. Only applies to lenses with spherical curves
C. Only applies to lenses with aspheric curves
D. All of the above
❖Only applies to lenses wih aspheric curves
This aberration results in a slight blurring of the image
due to the fact that a lens will have the tendency to focus
the light rays from the periphery sooner than the rays
passing through the central portion of the lens.
A. Chromatic
,Page 2 of 183
B. Spherical
C. Curvature of field
D. Coma
❖Spherical
In a cylinder lens if the strongest meridian does not run
exactly through ED meridian the lens thickness
computation will:
A. Error on advantageous side (predict lens slightly thicker
than actual)
B. Be of no value whatsoever
C. Error on disadvantageous side (predict lens to be
slightly thinner than actual)
D. Predict lens exactly
❖Error on advantageous side (slightly thicker than
actual)
,Page 3 of 183
In a sphere powered lens, the lens thickness computation
will:
A. Error on advantageous rule (slightly thicker)
B. Be of no value whatsoever
C. Error on Disadvantageous (slightly thinner)
D. Predict the thickness exactly
❖Predict the thickness exactly
If the computed thickness is greater than the patient
would accept, the dispenser should:
A. Apologize for wasting the patients time
B. Refer them back to the doctor
C. Rework the variables to achieve a different outcome
D. Select a larger frame
❖Rework the variables to achieve a different outcome
, Page 4 of 183
Which of the following variables can an optician vary to
create an Iseikonic lens?
A. Base curve, vertex distance, lens power
B. Center thickness, index of refraction, vertex distance
C. Lens power, base curve, center thickness
D. Vertex distance, pantoscopic angle, lenticular location
❖Center thickness, index of refraction, vertex distance
A plus lens could simply be described as:
A. Two prisms to apex
B. Two prisms base to base
C. A cylinder lens
D. None of the above
❖Two prisms base to base
A minus lens could simply be described as:
ABO ADVANCED STUDY GUIDE SET
QUESTIONS AND ANSWERS | VERIFIED AND
WELL DETAILED ANSWERS |DOWNLOAD AND
PASS | LATEST EXAM UPDATE 2026/2027
The sag lens formula:
A. Does not apply to lenses with spherical curves
B. Only applies to lenses with spherical curves
C. Only applies to lenses with aspheric curves
D. All of the above
❖Only applies to lenses wih aspheric curves
This aberration results in a slight blurring of the image
due to the fact that a lens will have the tendency to focus
the light rays from the periphery sooner than the rays
passing through the central portion of the lens.
A. Chromatic
,Page 2 of 183
B. Spherical
C. Curvature of field
D. Coma
❖Spherical
In a cylinder lens if the strongest meridian does not run
exactly through ED meridian the lens thickness
computation will:
A. Error on advantageous side (predict lens slightly thicker
than actual)
B. Be of no value whatsoever
C. Error on disadvantageous side (predict lens to be
slightly thinner than actual)
D. Predict lens exactly
❖Error on advantageous side (slightly thicker than
actual)
,Page 3 of 183
In a sphere powered lens, the lens thickness computation
will:
A. Error on advantageous rule (slightly thicker)
B. Be of no value whatsoever
C. Error on Disadvantageous (slightly thinner)
D. Predict the thickness exactly
❖Predict the thickness exactly
If the computed thickness is greater than the patient
would accept, the dispenser should:
A. Apologize for wasting the patients time
B. Refer them back to the doctor
C. Rework the variables to achieve a different outcome
D. Select a larger frame
❖Rework the variables to achieve a different outcome
, Page 4 of 183
Which of the following variables can an optician vary to
create an Iseikonic lens?
A. Base curve, vertex distance, lens power
B. Center thickness, index of refraction, vertex distance
C. Lens power, base curve, center thickness
D. Vertex distance, pantoscopic angle, lenticular location
❖Center thickness, index of refraction, vertex distance
A plus lens could simply be described as:
A. Two prisms to apex
B. Two prisms base to base
C. A cylinder lens
D. None of the above
❖Two prisms base to base
A minus lens could simply be described as:
